feat(ui): add Button, Modal, Spinner, Toast, and Tooltip components with styles

- Implemented Button component with various props for customization.
- Created Modal component with header, content, and footer subcomponents.
- Added Spinner component for loading indicators.
- Developed Toast component for displaying notifications.
- Introduced Tooltip component for contextual hints with keyboard shortcuts.
- Added corresponding CSS modules for styling each component.
- Updated index file to export new components.
- Configured TypeScript settings for the UI package.

.gitignore

@@ -9,8 +9,11 @@ apps/electron/dist
 apps/web/dist
 # Legacy
 discord-html-copy
-
 todo
 
+# Reference codebases used to port UI / features — not part of the build
+fluxer
+Brycord New UI
+
 # Deploy
 deploy/server/node_modules